A proper use of type is fundamental to create a good, and working, logo design. There are some logos where the typography is the essential element of the design, and where the designer works to make unique and communicative any single typeface. We are talking of typographic logos.
A clean and direct type-based logo can be a good solution to represent a serious company and many designers love researching the perfect balance among typefaces to create stunning logos, that’s not an easy operation… anyway they can be very effective, they can communicate in a simple and clever way a strong message.

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http://www.pvmgarage.com/en/2010/02/inspirational-showcase-of-type-based-logos/